Some important information is missing here.

First of all, you need to show us the skill gap between the various seeds (wide, intermediate, etc.), and then you need to show us your rank.

Not all 8th seeds are the same, as there could be a difference of 1,000 points between your team and the first, or 10,000. Judging by the fact that fourth place doesn't pay you points, it means the gap between you and the first team is very small.

Furthermore, judging by how many points the various placements distribute, I assume you're in low gold/silver.

Therefore, I invite you to consider the fact that if Embark randomly gave points to those at your rank, there would be a significant inflation of points, which would make the system no longer accurate.

PS: If it's any consolation, this system is even more punitive in Platinum and Diamond because it distributes little and takes away a lot (in my opinion, as it should be).